Bohr Blast in your lessons

• How an atom is built: protons and neutrons in the nucleus, electrons in shells (the Bohr model).
• All 118 elements with name, symbol, atomic number, group and period.
• The real number of electrons in every shell, so the pattern behind the periodic table becomes visible.
• Isotopes, radioactivity and half-life in the later worlds.
• A fact and a quiz question for every element, and a bigger question between the worlds.

It suits lessons on atoms and the periodic table in lower secondary school (grades 7 to 9).

Students play as Student, Researcher or Professor. The easier ones have slower electrons, and a hit is less costly; Professor is the full challenge.

• As Researcher the electrons are spread evenly, as in the Bohr model, through the first three worlds (elements 1 to 18), so the pattern 2, 8, 8 is there to see. From World 4 each atom is first shown spread evenly; then the electrons gather in small bundles to leave wider gaps.
• The card after every element shows a still drawing of the atom with the number of electrons in each shell.
• On their own, students choose the difficulty level themselves, and each one keeps its own progress.
• In a class round you choose one difficulty level for everyone, so the leaderboard is fair. We suggest Researcher for lessons; it is also what the game picks unless you change it.
• A student who gets stuck on an element is offered to carry on one difficulty level easier, without losing their place.

1. Choose Teacher login on the front page and type your email. We send you a code to sign in with. There is no password.
2. Create a class. It gets a class code, for example KTR-472.
3. Students open the game, type the code on the front page and choose a name. They need no email and no account.
4. Start a round. You choose how long it lasts (5 to 90 minutes), the difficulty level, where students start and whether power-ups are on.
5. Open the Projector view on the big screen. It shows the code, the clock and the live leaderboard.

• Everyone starts at the same moment, after a short countdown.
• There is no game over in a round. Hitting an electron costs 250 points, so careful play pays off.
• You can pause for everyone, add 2 minutes or end the round early.
• Your dashboard shows each student's cleared elements, quiz answers and electrons hit, so it is easy to spot someone who is stuck.
• Afterwards you see the results and can download them as a file for Excel or Numbers.
• Students can also play on their own, at school or at home, without a class.

When students play on their own, their stars and progress are saved in the browser on the device they use, not with us.

• On iPad and iPhone, Safari can delete what a website has saved if the site hasn't been opened for about a week. To avoid that, let students add Bohr Blast to the home screen: tap the Share button in Safari and choose Add to Home Screen.
• Do it before they start playing. The game on the home screen keeps its own progress, so progress made in Safari doesn't follow along.
• Progress also disappears if the browser's data is cleared, in a private window, or on a shared computer that resets.
• Scores from class rounds are saved on the server and are not affected. But a student who joined with a code is signed in through the browser too, and would have to join the class again as a new player.

In the atom builder, students put protons, neutrons and electrons together themselves and see which atom they get: which element it is, whether the nucleus is stable, and whether it is a neutral atom or an ion.

Every element they build stable and neutral is coloured in their own periodic table, from hydrogen to calcium. The table is saved in the student's browser, so you can see on their screen how far they have got.

Open the atom builder

• Students type a first name or a nickname, or pick one of the names the game suggests.
• Names are checked automatically, and offensive names are turned away.
• You can rename, lock or remove a student, and close the class to newcomers.

• Students who join with a code get an anonymous account on their device: no email and no password.
• We store the student's chosen name, class and scores, and the teacher's email and name.
• The data is stored in the EU (Frankfurt).
• No ads, no tracking and no third-party analytics.

• Questions can be read aloud, which helps students with dyslexia.
• The game is in 18 languages.
• It works with touch, mouse and keyboard.
• Shaking and trails can be switched off in Settings.

Playing with a class is free for schools, and it stays free. The coming app for iPhone, iPad and Android will help pay for it.

We would like to hear how it works in your class, and what is missing.

Questions